Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Isothermal oxidation behavior of reactive hot-pressed TiN–TiB2 ceramics at elevated temperatures
Abstract Isothermal oxidation behavior of reactive hot-pressed TiN–TiB2 ceramics with various TiN/TiB2 molar ratios of 2/1, 1/1 and 1/2 was evaluated in the temperature range of 500–800°C in air. TiN–TiB2 ceramics have a relative density of 97–98.6%. The oxidation weight gains of TiN–TiB2 ceramics depend upon the composition, oxidation temperature and exposure time. The structure and morphology of oxidized layers of TiN–TiB2 ceramics were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). During isothermal oxidation of TiN–TiB2 ceramics, anatase and rutile-TiO2 form as the oxidized products at 500°C. However, phase transformation from anatase to rutile occurs at temperatures between 500 and 600°C, and therefore rutile-TiO2 becomes the only crystalline phase after oxidation at temperatures of 600–800°C for 10h. The oxidation mechanism was proposed with reference to thermodynamically feasible oxidation reactions. The influence of composition on oxidation behavior of TiN–TiB2 ceramics varies with temperature.
Isothermal oxidation behavior of reactive hot-pressed TiN–TiB2 ceramics at elevated temperatures
Abstract Isothermal oxidation behavior of reactive hot-pressed TiN–TiB2 ceramics with various TiN/TiB2 molar ratios of 2/1, 1/1 and 1/2 was evaluated in the temperature range of 500–800°C in air. TiN–TiB2 ceramics have a relative density of 97–98.6%. The oxidation weight gains of TiN–TiB2 ceramics depend upon the composition, oxidation temperature and exposure time. The structure and morphology of oxidized layers of TiN–TiB2 ceramics were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). During isothermal oxidation of TiN–TiB2 ceramics, anatase and rutile-TiO2 form as the oxidized products at 500°C. However, phase transformation from anatase to rutile occurs at temperatures between 500 and 600°C, and therefore rutile-TiO2 becomes the only crystalline phase after oxidation at temperatures of 600–800°C for 10h. The oxidation mechanism was proposed with reference to thermodynamically feasible oxidation reactions. The influence of composition on oxidation behavior of TiN–TiB2 ceramics varies with temperature.
Isothermal oxidation behavior of reactive hot-pressed TiN–TiB2 ceramics at elevated temperatures
Yang, Zhen-Lin (Autor:in) / Ouyang, Jia-Hu (Autor:in) / Liu, Zhan-Guo (Autor:in)
23.06.2010
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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